This are light (and mostly short) dramas that I rewatched in the past, when I felt down:
Zombie Detective It's a hilarious comedy.
Queen of the Ring It's a cute cliche love story with a little bit of fantasy.
Go Ho's Starry Night It's a fun romance. FL writes article about perfect guy to date and she decides to write about her coworkers.
Naked Fireman Action, romance, humor in only 4 episodes.
Koe Koi A cute teenage love story. And ML always has a paperbag on his head because of a social fears.
Let me know if you liked any of them.